Former Vice President Kamala Harris made the mistake of believing her own press and that is the reason she was blindsided by her defeat to President Donald Trump in the November election, a new book claimed.

“She was completely shocked, and [Harris’ running mate] Tim Walz was shocked,” Amie Parnes a reporter for The Hill who is also the co-author of the new book, “Fight: Inside the Wildest Battle for the White House,” said on the “Somebody’s Gotta Win with Tara Palmeri,” podcast on Thursday.

She said that Harris’ vice-presidential pick, Minnesota Gov. Tim Walz, was also shocked by the defeat.

“He has no words. And people are kind of explaining to him, same thing with her. And she’s like, are you sure? Have we done a recount? Should we do a recount?” the author said on the show.

“They thought that they were going to win. And so, you know, when they come back now and say, ‘Oh, no, we didn’t really have a chance.’ No, that’s not what they were thinking. They thought they were going to win,” she said.

“Kamala Harris was looking at her crowd size, and they felt like the vibe was strong and people were saying, ‘Oh, we have more boots on the ground. We’re doing better in fundraising,'” the author said. “And she bought all of that. She bought the hype, and so did a lot of people in the campaign.”

The book claimed that the campaign, and Harris, believed that former President Joe Biden was to blame for her defeat.

“She could have won, she told friends, if only the election was later in the calendar — or she got in earlier. In other words, Joe Biden was to blame,” the book said.

But not everyone close to Harris believed that.

“That is f—ing bonkers,” one friend said. “If Election Day was October first, we might have actually somehow pulled it off. Shorter was actually better, not longer.”

“I don’t think we needed more time… We needed more substance. And she did not have more substance,” an advisor said in the book.